To open window the window is not closed under the impulse of the wind, it is easy to establish a kind of brake, which would not allow it to close, and left at least a crack. On the window and the window frame enough to attach a counter is a small single-pole magnets: pushing away from each other, they will preserve the cracks.
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GADGET — BULAVOCHKA
Fine fasteners — nut, washers, jump rings — easy to store (and use them), if you sort out and strung them on pins, not forgetting of course to close the head.
